Understanding Your Laboratory Test and Results

What is this test? This laboratory test examines a patient sample to look for specific substances, cells, or other markers that may provide information about your health.

The 17-Hydroxyprogesterone (17-OHP) test measures the amount of a hormone called 17-hydroxyprogesterone in the blood. This hormone is produced by the adrenal glands, which are small glands located on top of each kidney. The test is primarily used as part of newborn screening programs to check for a genetic condition called congenital adrenal hyperplasia (CAH).

Why is this test performed? Your clinician may order it to help evaluate symptoms, screen for a condition, monitor treatment, or check how your body is functioning over time.

This test is mainly performed on newborns as part of routine newborn screening. The goal is to detect CAH early, before symptoms develop. Congenital adrenal hyperplasia is a group of genetic disorders that affect the adrenal glands' ability to produce cortisol and sometimes aldosterone. When detected early, CAH can be managed effectively with medication, preventing serious complications such as salt-wasting crises, abnormal puberty, and growth problems.

How is the sample collected? Depending on the test, a trained healthcare professional may collect blood, urine, saliva, a swab, or another specimen using standard procedures designed to protect your comfort and safety.

For newborns, a small blood sample is typically collected by pricking the baby's heel. This is often done as part of the routine newborn screening panel, usually within 24-72 hours after birth. The blood is placed on a special filter paper and sent to a laboratory for testing. In some cases, the test may also be performed on a blood sample drawn from a vein in older children or adults who are being evaluated for CAH or related conditions.

What do the results mean? Results are interpreted using the laboratory’s reference range, your medical history, symptoms, and other findings, so an abnormal value does not always mean that you have a disease.

Normal 17-OHP levels vary by age and can differ between laboratories. Higher than normal levels may indicate congenital adrenal hyperplasia. However, a single elevated result does not confirm the diagnosis. Follow-up testing, including repeat 17-OHP measurement and possibly genetic testing, is usually needed to confirm the diagnosis. Some newborns may have temporarily elevated 17-OHP due to stress or prematurity, so clinical correlation is important.